package com.hh.ListNodeQuestions;

/**
 * @Author hanghao
 * @Date 2023/6/28 15:43
 * @Version 1.0
 * middle
 * 两数相加
 */

public class No2 {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode dummy = new ListNode(0);
        ListNode cur = dummy;
        int carry = 0;
        while (l1 != null || l2 != null) {
            int x = l1 == null ? 0 : l1.val;
            int y = l2 == null ? 0 : l2.val;
            int sum = x + y + carry;
            carry = sum / 10;
            sum = sum % 10;
            cur.next = new ListNode(sum);
            cur = cur.next;
            if (l1 != null) {  //如果已经为空了 就不用往后继续移动了
                l1 = l1.next;
            }
            if (l2 != null) {
                l2 = l2.next;
            }
        }
        if (carry == 1) {
            cur.next = new ListNode(1);
        }
        return dummy.next;
    }
}
